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Tucson Electric Power

In 2006, Arizona's utility regulators at the Corporation Commission approved the Renewable Energy Standard and Tariff (REST) stipulating that all utilities are to generate 15 % of their energy by renewable sources by 2025. This gave a push to solar water heating, because the utilities subsidised solar water heaters whenever they offset electric water heaters. In 2011, US-based consultancy GTM Research placed Arizona at the pole position – before Hawaii – in the ranking of the states with the highest number of installed solar water heaters (see chart). But then PV became more popular and led to a drastically reduced demand for solar thermal systems. In 2016, the state’s largest utility, Arizona Public Service (APS), will even let the incentives for solar thermal run out, as their renewable target has already been reached.
Source: GTM Research